Abstract
view Abstract Citations (68) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Properties of OB Supergiants in the Large Magellanic Cloud. II. Spectral Types and Intrinsic Colors Fitzpatrick, Edward L. Abstract We have isolated a sample of about 90 of the most lightly reddened "normal" O and B supergiants in the LMC for a study of their spectroscopic and photometric properties. New MK spectral classifications are presented for 83 of the stars, about half of which have no previously reported slit spectral types. Intrinsic color relations are derived for the LMC supergiants using new observations in the Stromgren uvby system and published data in the Johnson UBV system. The shapes of the intrinsic UBV and uvby relations for the LMC stars are similar to published Galactic calibrations for Ia supergiants. In the Stromgren system, the derived spectral type versus intrinsic color calibration for the B supergiants also agrees well with Galactic calibrations. In the Johnson system, the LMC calibration is systematically redder, particularly in (U-B)0, than reported for Galactic stars. Because the LMC calibrations in the two systems have been derived in a mutally consistent manner using the same sample of stars, this suggests that the Galactic calibrations are not consistent. In other words, the Stromgren and Johnson colors attributed to a given Galactic B supergiant subtype cannot be produced by the same star. This inconsistency probably results from the small numbers and the different samples of Galactic supergiants being used in the various calibration studies and from uncertainties introduced by the typically much higher reddening of the Galactic stars. Comparison of the LMC intrinsic color calibrations with synthetic photometry of line-blanketed, plane-parallel, LTE model atmospheres shows that the B-type supergiant colors can be reproduced by this class of models. Publication: The Astrophysical Journal Pub Date: December 1988 DOI: 10.1086/166960 Bibcode: 1988ApJ...335..703F Keywords: Astronomical Photometry; Early Stars; Interstellar Matter; Magellanic Clouds; Supergiant Stars; Ubv Spectra; B Stars; Milky Way Galaxy; O Stars; Astrophysics; GALAXIES: MAGELLANIC CLOUDS; INTERSTELLAR: MATTER; PHOTOMETRY; STARS: EARLY-TYPE; STARS: SPECTRAL CLASSIFICATION; STARS: SUPERGIANTS full text sources ADS | data products SIMBAD (114) GCPD (1) Related Materials (1) Part 1: 1987ApJ...312..596F
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
